Monitor changes to DOM elements with JavaScript Mutation Observer

Question

Monitor changes to DOM elements with JavaScript Mutation Observer

Recently, I've been experimenting with a Mutation Observer and using the following configuration:

config = { characterData: true, characterDataOldValue: true };

This is the structure of my HTML page:

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <script src="script.js"></script>
        <title>Test</title>
</head>
<body>
    <p id="test" contenteditable="true">Test<b>subtree</b>test</p>

Interestingly, the Mutation observer wasn't functioning as expected until I included 'subtree' in the config:

config = { characterData: true, subtree: true, characterDataOldValue: true };

I'm a bit puzzled as to why this is necessary. Any explanations?

javascript

Answer 1

Answer №1

Here is the mutation observer code that is functioning correctly. To pinpoint the exact issue, could you share more of your code? For additional details, you can refer to the following article: DOM MutationObserver – reacting to DOM changes without killing browser performance.

const targetNode = document.getElementById('test');
console.log(targetNode);

// Creating an observer instance linked to the callback function
const observer = new MutationObserver((mutationList, observer) => {
  console.log("working");
});

// Define options for the observer (which mutations to observe)
const config = { attributes: true, childList: true, subtree: true };

// Start observing the target node for configured mutations
observer.observe(targetNode, config);

// If needed, you can stop observing later
//observer.disconnect();

<p id="test" contenteditable="true">Test</p>

Answer 2

Here is the mutation observer code that is functioning correctly. To pinpoint the exact issue, could you share more of your code? For additional details, you can refer to the following article: DOM MutationObserver – reacting to DOM changes without killing browser performance.

const targetNode = document.getElementById('test');
console.log(targetNode);

// Creating an observer instance linked to the callback function
const observer = new MutationObserver((mutationList, observer) => {
  console.log("working");
});

// Define options for the observer (which mutations to observe)
const config = { attributes: true, childList: true, subtree: true };

// Start observing the target node for configured mutations
observer.observe(targetNode, config);

// If needed, you can stop observing later
//observer.disconnect();

<p id="test" contenteditable="true">Test</p>

Monitor changes to DOM elements with JavaScript Mutation Observer

Answer №1

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